अतिरिक्त संसाधन

• Exam questions for Class IX: http://cbse-notes.blogspot.co.uk/ 2012/ 10/ cbse-class-9-science-ch-13-why-do-we.html [Tip: hold Ctrl and click a link to open it in a new tab. (Hide tip)] (accessed 20 May 2014)
• A PowerPoint presentation covering the key points: http://www.slideshare.net/ MADHUPARNABHOWMIK/ why-do-we-fall-ill-29421845 (accessed 20 May 2014)
• A video on ‘Why do we fall ill?’: https://www.youtube.com/ watch?v=_B6lDPNtZs4 (accessed 20 May 2014)
• A video discussing the difference between fungi, bacteria and viruses: https://www.youtube.com/ watch?v=dWAdY57SQHs (accessed 20 May 2014)
• An activity to raise awareness of the effect of smoking: http://www.raftbayarea.org/ ideas/ Catching%20Your%20Breath.pdf (accessed 20 May 2014)